#include <stdio.h>
#define COLS 4
int sum2d(const int ar[][COLS], int rows);
int sum(const int ar[], int n);
int main(void)
{
    int total1, total2, total3;
    int *pt1;
    int(*pt2)[COLS];
    pt1 = (int[2]){10, 20};
    pt2 = (int[2][COLS]){{1, 2, 3, -9}, {4, 5, 6, -8}};
    total1 = sum(pt1, 2);
    total2 = sum2d(pt2, 2);
    total3 = sum((int[]){4, 4, 4, 5, 5, 5}, 6);
    printf("total1 = %d\n", total1);
    printf("total2 = %d\n", total2);
    printf("total3 = %d\n", total3);
    return 0;
}
int sum(const int ar[], int n)
{
    int i;
    int total = 0;
    for (i = 0; i < n; i++)
    {
        total += ar[i];
    }
    return total;
}
int sum2d(const int ar[][COLS], int rows)
{
    int r;
    int c;
    int tot = 0;
    for (r = 0; r < rows; r++)
    {
        for (c = 0; c < COLS; c++)
        {
            tot += ar[r][c];
        }
    }
    return tot;
}